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I'm also naming them property and value, since that's the usual name for such things (or key and value). If you want to make it clear that all the parts are required, then just use regular arguments: function findIndexInData(data, property, value) Why are you using an object to pass the arguments? You need all three components ( data, where, and what), whereas a object usually means each part is optional. But I'd like to comment on your current code: In the next tutorial, we will discuss Array some() method with the help of examples.Eric Blade is correct that this is a perfect use-case for findIndex. Hope that you will have understood how to find the index of the first matching element in an array based on specific test condition using findIndex() method.

In this tutorial, you have learned array findIndex() method in JavaScript with the help of example programs. The general syntax of the findIndex() method in JavaScript is: // Arrow functionĪrr.findIndex((element) => ) => name = 'Belly') Let index = numbers.findIndex(isGreater) Ĭonsole.log("Index of first greater number than 2: " +index) Find the index of first greater number than 2.

Callback function to check greater number than 2. It executes the callback function once for every index in the array until. The () method returns an index in the array if an element in the array satisfies the provided testing function otherwise, it will return -1, which indicates that no element passed the test. Otherwise, it returns -1 if no matching is found.įor example, the following snippet code returns the index of the first number that’s greater than 2. Javascript find index of an array that contains object. Definition and Usage If it finds an array element where the function returns a true value, findIndex() returns the index of that array element (and does not. The find () method executes a function for each array element.

In other words, find() method of array returns the index of first array element that satisfies provided testing function (i.e. The find () method returns the value of the first element that passes a test.